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How does the mobile experience compare between Germany and Nigeria? There iscurrently no public data or test-bed to provide an answer to this question.This is because deploying and maintaining such test-bed can be both challengingand expensive. To fill this gap, this paper proposes a novel test-bed designcalled "AmiGo", which relies on travelers carrying mobile phones to act asvantage points and collect data on mobile network performance. The "AmiGo"design has three key advantages: it is easy to deploy, has realistic usermobility, and runs on real Android devices. We further developed a suite ofmeasurement tools for "AmiGo" to perform network measurements, e.g., pings,speedtests, and webpage loads. We leverage these tools to measure theperformance of 24 mobile networks across five continents over a month via an"AmiGo" deployment involving 31 students. We find that 50% of networks face a40-70% chance of providing low data rates, only 20% achieve low latencies, andnetworks in Asia, Central/South America, and Africa have significantly higherCDN download times than in Europe. Most news websites load slowly, whileYouTube performs well. We made both test-bed and measurement tools open source.

A Worldwide Look Into Mobile Access Networks Through the Eyes of AmiGos